abandencecustom CSS for the firefox extension “tree style tabs” to make it not horrible, paste this into the extension settings
tab-item:not([data-child-ids]) tab-twisty {
margin-left: -12px;
}
tab-item tab-label {
padding-bottom: 0;
}
tab-item {
align-items: center;
}
:root #tabbar-container {
top: 0 !important;
}
:root {
--tab-surface-hover: #1b1b1b;
}
tab-item[data-parent-id].active {
border-left: 1px solid #0a84ff;
}